Question

If the acceleration due to gravity at earth is ‘g’ and mass of earth is 80 times that of moon
and radius of earth is 4 times that of moon, the value of ‘g’ at the surface of moon will be

Answer 1

Answer:

80Mm=Me

80=Me/Mm

4Rm=Re

4=Re/Rm

ge=g

g=Gm/R^2

gE/gM=GMe/Re^2

____________

GMm/Rm^2

gE/gm=Me/Mm×Rm^2/Re^2

=80×(1/4)^2

= 80×1/16

g/gm=5

gm=g/5